645499000 has 32 divisors (see below), whose sum is σ = 1510470000. Its totient is φ = 258199200.

The previous prime is 645498983. The next prime is 645499021. The reversal of 645499000 is 994546.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 321750 + ... + 323749.

Almost surely, 2^645499000 is an apocalyptic number.

It is an amenable number.

645499000 is an abundant number, since it is smaller than the sum of its proper divisors (864971000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645499000 is a wasteful number, since it uses less digits than its factorization.

645499000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645520 (or 645506 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 645499000 is about 25406.6723519630. The cubic root of 645499000 is about 864.2350148006.

The spelling of 645499000 in words is "six hundred forty-five million, four hundred ninety-nine thousand".